How to Set up Sending Domains

To help keep deliverability as high as possible, Mandrill requires that every sending domain is configured to allow Mandrill to send authenticated emails on behalf of that domain.

Note

You'll need to add SPF and DKIM records and verify ownership of your sending domains before you can send email through your account. Mandrill will not send any email from unverified domains or domains without valid SPF and DKIM records, including public domains like gmail.com, yahoo.com, and more.

A message that is rejected with the reject reason unsigned indicates that the sending domain hasn't been properly set up, and that your account is unable to send and authenticate email from that domain.

Verify the Domain

Domain Verification is required to configure a sending domain. Verification used to be optional for many Mandrill users, so please check that any domains actively used for sending have three green check marks on the sending domains page:

Verify a domain on the Sending Domains page in your Mandrill account or with the Mandrill API using the /senders/verify-domain endpoint. To confirm ownership of the domain, we'll send an email with a confirmation link to the address you specify, so you'll need to make sure that the domain can accept incoming email.